[Feature Request]: Documentation for addons Expunge & Extend

[LaurenceBarnes]

I have confirmed that ...

• There is no duplicate feature request.

Description

As I have never done a PR (even to just documentation) before, I simply raise an issue regarding that.

Unlike for the other addons, the docs still lack a short documentation (I wrote it so you can copy/paste it, without the referring commit link of course, into the docs if you so wish. Of course formatting may still be necessary.) for the following addons:

Expunge (added with e93b317)

Provides the /libertybans expunge <id> command. This allows to remove the specified punishment from the database record. Useful for removing invalid/unintentional punishments.

Requires the permission libertybans.addon.expunge.use

Extend (added with b5b4aa8)

Provides the /libertybans extend <id> <time> command. Allows to extend a specified existing (active) punishment for a specified additional duration.

Requires the permission libertybans.addon.extend.use